CN214069807U - Spread spectrum circuit for suppressing electromagnetic interference - Google Patents
Spread spectrum circuit for suppressing electromagnetic interference Download PDFInfo
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- CN214069807U CN214069807U CN202022934286.4U CN202022934286U CN214069807U CN 214069807 U CN214069807 U CN 214069807U CN 202022934286 U CN202022934286 U CN 202022934286U CN 214069807 U CN214069807 U CN 214069807U
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Abstract
The utility model discloses a spread spectrum circuit for suppressing electromagnetic interference, which is used for suppressing the electromagnetic interference of a main control MCU (microprogrammed control unit) of a terminal and a terminal load and comprises a frequency generation module, a control module, a spread spectrum mode configuration module, a spread spectrum output module and an enabling module; the frequency generation module and the enabling module are arranged on the left side of the control module and are electrically connected with each other respectively, and the spread spectrum mode configuration module and the spread spectrum output module are arranged on the right side of the control module and are electrically connected with each other respectively. The method effectively inhibits electromagnetic interference, solves the problems that the common metal shielding cover inhibits electromagnetic emission and the clock signal waveform is changed by filtering inhibition of a filter circuit to influence the working stability of the system, saves a phase-locked loop circuit and is beneficial to saving cost.
Description
Technical Field
The utility model relates to an electricity frequency control technical field especially relates to a restrain electromagnetic interference's spread spectrum circuit.
Background
With the change of science and technology, people pursue higher and higher quality of electronic products, and the electromagnetic interference is always optimized in solving the problem of the quality of the electronic products. It is to be understood that emi has been a problem that is difficult to completely overcome in the electrical technology field, but the design is optimized so that the clock and data sources are less emi.
At present, in most electronic products, a traditional phase-locked loop is often used as a feedback control circuit, the peak energy distribution is narrow and less controllable in an energy band, and the narrow-band signal ratio of a system to an oscillator and most frequency generators is increased. Furthermore, the use of a phase-locked loop increases the cost and limits the operation of the non-periodic signal. In addition, in EMI certification, the digital signal of an electronic product during operation needs to be filtered out or shielded from high frequency by clocking, enabling, latching, inputting a power signal to suppress electromagnetic interference.
Although the metal shielding case can inhibit electromagnetic emission, due to the trend of small-scale integration development of current electronic products, the wiring in the PCB is relatively more complicated, and the electromagnetic emission is easy to carry out crosstalk emission through the PCB wiring. If the suppression is performed in a filtering mode, the waveform of the clock signal is changed by the filtering circuit, the integrity of the clock signal is damaged, and the working stability of the system is influenced. Therefore, it is desirable to provide a spread spectrum circuit for suppressing electromagnetic interference to solve the problems of the prior art.
SUMMERY OF THE UTILITY MODEL
To the defect that above-mentioned prior art exists, the utility model aims to provide a restrain electromagnetic interference's spread spectrum circuit.
In order to achieve the above object, the present invention provides a spread spectrum circuit for suppressing electromagnetic interference, which is used for suppressing electromagnetic interference between a main control MCU of a terminal and a terminal load, and comprises a frequency generation module, a control module, a spread spectrum mode configuration module, a spread spectrum output module and an enable module; the frequency generation module and the enabling module are arranged on the left side of the control module and are respectively and electrically connected, and the spread spectrum mode configuration module and the spread spectrum output module are arranged on the right side of the control module and are respectively and electrically connected.
Preferably, the control module includes a control chip U1, the control chip U1 includes a clock input/output pin, the frequency generation module includes a clock source Y1, a resistor R1, a resistor R2, a capacitor C2 and a capacitor C3, a first end of the resistor R1 is connected to the clock input pin, a second end of the resistor R1 is connected to a first end of the clock source Y1 and a first end of the capacitor C2, a first end of the resistor R2 is connected to the clock output pin, a second end of the resistor R2 is connected to a second end of the clock source Y1 and a first end of the capacitor C3, and a second end of the capacitor C2 and a second end of the capacitor C3 are both grounded.
Preferably, the control chip U1 further includes an enable pin, the enable module includes a resistor R3, a first end of the resistor R3 is connected to the enable pin, and a second end of the resistor R3 is connected to the terminal main control MCU.
Preferably, the control chip U1 further includes a first mode configuration pin and a second mode configuration pin, the spread spectrum mode configuration module includes a resistor R4 and a resistor R5, a first end of the resistor R4 is connected to the first mode configuration pin, a first end of the resistor R5 is connected to the second mode configuration pin, and a second end of the resistor R4 and a second end of the resistor R5 are both connected to a power supply.
Preferably, a pull-down resistor R8 and a pull-down resistor R9 are further disposed on the spread spectrum mode configuration module, a first end of the pull-down resistor R8 is connected to a second end of the resistor R5, a first end of the pull-down resistor R9 is connected to a second end of the resistor R4, and a second end of the pull-down resistor R8 and a second end of the pull-down resistor R9 are both grounded.
Preferably, the control chip U1 includes a mode output pin, the spread spectrum output module includes a resistor R6 and a resistor R7, a first end of the resistor R6 is connected to the mode output pin, a second end of the resistor R6 is connected to a first end of the resistor R7 and then connected to a terminal load, and a second end of the resistor R7 is grounded.
Preferably, the control chip comprises a power supply pin and a ground pin, wherein the power supply pin is connected with a power supply and is grounded through a capacitor C1, and the ground pin is grounded.
Compared with the prior art, the beneficial effects of the utility model are that:
a spread spectrum circuit for suppressing electromagnetic interference is used for suppressing the electromagnetic interference of a terminal main control MCU and a terminal load, and comprises a frequency generation module, a control module, a spread spectrum mode configuration module, a spread spectrum output module and an enabling module; the frequency generation module and the enabling module are arranged on the left side of the control module and are electrically connected with each other respectively, and the spread spectrum mode configuration module and the spread spectrum output module are arranged on the right side of the control module and are electrically connected with each other respectively. The method effectively inhibits electromagnetic interference, solves the problems that the common metal shielding cover inhibits electromagnetic emission and the clock signal waveform is changed by filtering inhibition of a filter circuit to influence the working stability of the system, saves a phase-locked loop circuit and is beneficial to saving cost.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without any creative effort.
Fig. 1 is a schematic diagram of the circuit structure of the present invention.
Description of reference numerals:
1. a frequency generation module; 2. a clock input/output pin; 3. an enabling module; 4. an enable pin; 5. a mode configuration pin; 6. a spread spectrum mode configuration module; 7. a mode output pin; 8. a spread spectrum output module; 9. a terminal main control MCU; 10. and (4) terminal load.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in the specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
Referring to fig. 1, in an embodiment of the present invention, a spread spectrum circuit for suppressing electromagnetic interference is used for suppressing electromagnetic interference between a terminal main control MCU9 and a terminal load 10, and includes a frequency generation module 1, a control module, a spread spectrum mode configuration module 6, a spread spectrum output module 8, and an enable module 3; the frequency generation module 1 and the enabling module 3 are both arranged on the left side of the control module and are respectively and electrically connected, and the spread spectrum mode configuration module 6 and the spread spectrum output module 8 are both arranged on the right side of the control module and are respectively and electrically connected.
The control module comprises a control chip U1, the control chip U1 comprises a clock input/output pin 2, the frequency generation module 1 comprises a clock source Y1, a resistor R1, a resistor R2, a capacitor C2 and a capacitor C3, a first end of the resistor R1 is connected with the clock input pin, a second end of the resistor R1 is connected with a first end of a clock source Y1 and a first end of the capacitor C2, a first end of the resistor R2 is connected with the clock output pin, a second end of the resistor R2 is connected with a second end of the clock source Y1 and a first end of the capacitor C3, and a second end of the capacitor C2 and a second end of the capacitor C3 are both grounded. The frequency generation module 1 is used for frequency generation, for example, the clock source Y1 sends out a clock frequency signal. Further, the control chip U1 includes a power supply pin and a ground pin, the power supply pin is connected to a power supply and is grounded through the capacitor C1, and the ground pin is grounded.
The control chip U1 further includes an enable pin 4, the enable module 3 includes a resistor R3, a first end of the resistor R3 is connected to the enable pin 4, a second end of the resistor R3 is connected to the terminal main control MCU9, and when the terminal main control MCU9 outputs a high level, the control chip U1 is enabled to operate; when the terminal master control MCU9 outputs a low level, the control chip U1 stops working.
The control chip U1 further includes a first mode configuration pin 5 and a second mode configuration pin 5, the spread spectrum mode configuration module 6 includes a resistor R4 and a resistor R5, a first terminal of the resistor R4 is connected to the first mode configuration pin 5, a first terminal of the resistor R5 is connected to the second mode configuration pin 5, and a second terminal of the resistor R4 and a second terminal of the resistor R5 are both connected to the power supply. The high level is pulled through the resistor R4 and the resistor R5, so that the frequency waveform required by the output of the spread spectrum circuit for suppressing the electromagnetic interference is configured.
In order to better suppress the electromagnetic interference of the power supply, the spread spectrum mode configuration module 6 is further provided with a pull-down resistor R8 and a pull-down resistor R9, a first end of the pull-down resistor R8 is connected to a second end of the resistor R5, a first end of the pull-down resistor R9 is connected to a second end of the resistor R4, and a second end of the pull-down resistor R8 and a second end of the pull-down resistor R9 are both grounded.
The control chip U1 includes a mode output pin 7, the spread spectrum output module 8 includes a resistor R6 and a resistor R7, a first end of the resistor R6 is connected to the mode output pin 7, a second end of the resistor R6 is connected to a first end of the resistor R7 and then connected to the terminal load 10, and a second end of the resistor R7 is grounded. The CLK _ OUT signal output by the spread spectrum output module 8 is sent to the terminating load 10 for controlling the terminating load 10 to operate normally.
The utility model provides a pair of suppress electromagnetic interference's spread spectrum circuit theory of operation is: when the clock source Y1 in the frequency generation module 1 generates a clock frequency signal and reaches the clock input pin of the control chip U1, the terminal main control MCU9 outputs a high level to enable the control chip U1 to be in a normal operating state, and then the first mode configuration pin 5 and the second mode configuration pin 5 are configured in a mode by the spread spectrum mode configuration module 6, so that the mode output pin 7 of the control chip U1 outputs the clock frequency signal of the clock source Y1 to the terminal load 10 after being spread spectrum, so as to control the terminal load 10 to operate normally and effectively suppress electromagnetic interference. The spread spectrum circuit for suppressing the electromagnetic interference solves the problems that the common metal shielding cover suppresses electromagnetic emission and changes clock signal waveforms caused by filtering suppression of the filter circuit affect the working stability of the system, saves a phase-locked loop circuit, and is favorable for saving cost.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. The utility model provides a spread spectrum circuit of suppression electromagnetic interference for the electromagnetic interference of suppression terminal master control MCU and terminal load, its characterized in that: the device comprises a frequency generation module, a control module, a spread spectrum mode configuration module, a spread spectrum output module and an enabling module; the frequency generation module and the enabling module are arranged on the left side of the control module and are respectively and electrically connected, and the spread spectrum mode configuration module and the spread spectrum output module are arranged on the right side of the control module and are respectively and electrically connected.
2. The spread spectrum circuit for suppressing emi as recited in claim 1, wherein: the control module comprises a control chip U1, the control chip U1 includes a clock input/output pin, the frequency generation module includes a clock source Y1, a resistor R1, a resistor R2, a capacitor C2 and a capacitor C3, a first end of the resistor R1 is connected to the clock input pin, a second end of the resistor R1 is connected to a first end of the clock source Y1 and a first end of the capacitor C2, a first end of the resistor R2 is connected to the clock output pin, a second end of the resistor R2 is connected to a second end of the clock source Y1 and a first end of the capacitor C3, and a second end of the capacitor C2 and a second end of the capacitor C3 are both grounded.
3. The spread spectrum circuit for suppressing emi as claimed in claim 2, wherein: the control chip U1 further includes an enable pin, the enable module includes a resistor R3, a first end of the resistor R3 is connected to the enable pin, and a second end of the resistor R3 is connected to the terminal main control MCU.
4. The spread spectrum circuit for suppressing emi as claimed in claim 2, wherein: the control chip U1 further includes a first mode configuration pin and a second mode configuration pin, the spread spectrum mode configuration module includes a resistor R4 and a resistor R5, a first terminal of the resistor R4 is connected to the first mode configuration pin, a first terminal of the resistor R5 is connected to the second mode configuration pin, and a second terminal of the resistor R4 and a second terminal of the resistor R5 are both connected to a power supply.
5. The spread spectrum circuit for suppressing electromagnetic interference of claim 4, wherein: the spread spectrum mode configuration module is further provided with a pull-down resistor R8 and a pull-down resistor R9, the first end of the pull-down resistor R8 is connected with the second end of the resistor R5, the first end of the pull-down resistor R9 is connected with the second end of the resistor R4, and the second end of the pull-down resistor R8 and the second end of the pull-down resistor R9 are both grounded.
6. The spread spectrum circuit for suppressing emi as claimed in claim 2, wherein: the control chip U1 includes the mode output pin, the spread spectrum output module includes resistance R6 and resistance R7, the first end of resistance R6 with the mode output pin is connected, the second end of resistance R6 with be connected the back with the terminal load with the first end of resistance R7, the second end ground of resistance R7.
7. The spread spectrum circuit for suppressing emi as claimed in claim 2, wherein: the control chip comprises a power supply pin and a grounding pin, wherein the power supply pin is connected with a power supply and is grounded through a capacitor C1, and the grounding pin is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022934286.4U CN214069807U (en) | 2020-12-10 | 2020-12-10 | Spread spectrum circuit for suppressing electromagnetic interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022934286.4U CN214069807U (en) | 2020-12-10 | 2020-12-10 | Spread spectrum circuit for suppressing electromagnetic interference |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214069807U true CN214069807U (en) | 2021-08-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022934286.4U Active CN214069807U (en) | 2020-12-10 | 2020-12-10 | Spread spectrum circuit for suppressing electromagnetic interference |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214069807U (en) |
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- 2020-12-10 CN CN202022934286.4U patent/CN214069807U/en active Active
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